Scroll Compressor Back Pressure Chamber Eccentricity

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Solution Overview

Problem

The existing scroll compressor design experiences instability and refrigerant leakage due to unbalanced forces during compression, leading to inefficiency and wear between the fixed and orbiting scrolls, which results in reduced lifespan and reliability.

Innovation Solution

The scroll compressor incorporates a back pressure chamber with its center eccentrically disposed relative to the fixed scroll, ensuring stability by applying intermediate pressure effectively, preventing the fixed scroll from floating during maximum gas force, and maintaining uniform back pressure across the compression chamber.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the back pressure chamber center is aligned with the fixed scroll center, then the structure is simple and easy to manufacture, but the fixed scroll becomes unstable during compression due to unbalanced gas forces

Engineering Contradiction:

Improvestructural simplicityVSAvoidfixed scroll stability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The patent applies asymmetry by deliberately misaligning the back pressure chamber center from the fixed scroll center. The back pressure chamber is positioned eccentrically relative to the fixed scroll, creating an asymmetric pressure distribution that generates a counterbalancing force to offset the unbalanced gas forces during compression, thereby stabilizing the fixed scroll.

Inventive Principle:

Principle #4Asymmetry

2Device complexity

If the back pressure chamber center is aligned with the fixed scroll center, then the design is straightforward, but refrigerant leakage occurs due to fixed scroll movement

Engineering Contradiction:

Improvedesign complexityVSAvoidsealing reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The asymmetric positioning of the back pressure chamber creates a stabilizing effect that prevents fixed scroll movement, thereby maintaining reliable sealing between the fixed and orbiting scrolls and preventing refrigerant leakage.

Inventive Principle:

Principle #4Asymmetry

3Ease of manufacture

If the back pressure chamber center is aligned with the fixed scroll center, then the assembly is simple, but wear between scrolls increases due to instability

Engineering Contradiction:

Improveassembly simplicityVSAvoidcompressor lifespan

Core Design Contradiction:

Ease of manufactureVSDuration of action of stationary object

Solution Approach 1:

The asymmetric design stabilizes the fixed scroll during compression, reducing friction and wear between the fixed and orbiting scrolls, thereby extending the compressor's operational life and reliability.

Inventive Principle:

Principle #4Asymmetry

4Device complexity

If the back pressure chamber center is aligned with the fixed scroll center, then the structure is symmetric and simple, but compression efficiency deteriorates due to gap widening

Engineering Contradiction:

Improvestructural complexityVSAvoidcompression efficiency

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The asymmetric positioning of the back pressure chamber prevents widening of the gap between the fixed and orbiting scrolls by stabilizing the fixed scroll position, thereby maintaining compression efficiency and preventing deterioration.

Inventive Principle:

Principle #4Asymmetry

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design enhances the stability and movement of the orbiting scroll, improving compression efficiency and reliability by preventing refrigerant leakage and wear, thus extending the compressor's lifespan.

Implementation Method 1

A back pressure chamber pressurizing the fixed scroll with an intermediate pressure between a suction pressure and a discharge pressure

Methodology Applied

Scientific EffectPressure: Pressure Increase

Implementation Method 2

The two scrolls (a fixed scroll and an orbiting scroll) include a wrap respectively. While the wraps make relative orbital movements, a plurality of compression chambers is formed between the scrolls

Methodology Applied

Scientific EffectOrbital motion:

Implementation Method 3

A volume of the compression chamber is reduced while the compression chamber continues to move in an approximately central direction from a suction port, into which refrigerants are suctioned, towards a discharge port

Methodology Applied

Scientific EffectCompression: Compression

Data Source

PatentUS11242854B2Scroll compressor

Publication Date: 2022.02.08 LG ELECTRONICS INC

AI summary

A scroll compressor is provided in which a center of a back pressure chamber is eccentrically disposed relative to a center of a fixed scroll. For example, the center of the back pressure chamber may be moved towards a center of an orbiting scroll at a time of discharge, thereby preventing displacement of the fixed scroll and ensuring stability in orbital movement of the orbiting scroll.